*: Depending on the type of your query sequence and the type of the database you choose,
four different kinds of the BLAST program can be run:
- BLASTP, Protein Query Searching a Protein Database
Each database sequence is compared to each query in a separate
protein-protein pairwise comparison.- BLASTX, Nucleotide Query Searching a Protein Database
Each query is translated, and each of the six products is compared to
each database sequence in a separate protein-protein pairwise comparison.- BLASTN, Nucleotide Query Searching a Nucleotide Database
Each database sequence is compared to the query in a separate
nucleotide-nucleotide pairwise comparison.- TBLASTN, Protein Query Searching a Nucleotide Database
Each nucleotide database sequence is translated, and each of the six
products is compared to the queries in a separate protein-protein
pairwise comparison.